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jadekelllly

  • 2 years ago

solve cos(2x-4)=sin(6x)

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  1. RadEn
    • 2 years ago
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    what's interval for x ?

  2. jadekelllly
    • 2 years ago
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    i have no clue, im doing the work sheet and that is all it says for this question

  3. jadekelllly
    • 2 years ago
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    it says solve for x

  4. dan815
    • 2 years ago
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    |dw:1371573363440:dw|

  5. dan815
    • 2 years ago
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    remember complimentary angles

  6. jadekelllly
    • 2 years ago
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    the answer choices are 20, -11, 10.75, or 11.75

  7. dan815
    • 2 years ago
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    forget your answers, understand concept

  8. RadEn
    • 2 years ago
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    if just in the 1st quadrant. u can use the identity : cosx = sin(90-x) cos(2x-4)=sin(6x) sin(90-(2x-4))=sin(6x) 90-(2x-4) = 6x solve for x the result would be same like @dan817 said :)

  9. RadEn
    • 2 years ago
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    oppss 815 not 817, hihi :)

  10. dan815
    • 2 years ago
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    hi :)

  11. dan815
    • 2 years ago
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    do u see how complimentary angles work now

  12. dan815
    • 2 years ago
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    in a right angled triangle the 2 other angles must add up to 90

  13. jadekelllly
    • 2 years ago
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    Im really slow at picking up these concepts.....:/ so this im reallly lost..

  14. dan815
    • 2 years ago
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    hmm how else can i explain it

  15. jadekelllly
    • 2 years ago
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    btw i really appriciate the help you guysss!!

  16. dan815
    • 2 years ago
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    no lets do it between 4 to pi+4 for 1 interval of your cos(2x-4)

  17. RadEn
    • 2 years ago
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    hmmm.. for easier, solve this algebrically :) can u solve for x, this part : |dw:1371574314002:dw|

  18. dan815
    • 2 years ago
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    first solve an x that works and ill show u how u can find all the other xs that work

  19. schadie
    • 2 years ago
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    |dw:1371574763654:dw|

  20. Vitas
    • 2 years ago
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    cos(2x-4)=cos(90-6x) a)2x-4=90-6x+360k b)2x-4=6x-90+360k a)x=94/8+45k b)x=86/4+90k

  21. Protien
    • 2 years ago
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    x=11.75

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